【单选题】民俗是指在一定历史时期,一个地区的人民群众都有自己相对固定的 。
【单选题】目前世界上有大约多少种重金属的超级累植物( )。
【简答题】Since we have invited all the other neighbors to our 25 th wedding anniversary party, we feel obliged to invite the Browns, too.
【单选题】Since we have invited a ll the other neighbors to our 2 5 th wedding anniversary party, we invite the Browns too .